The growing amount of RES-E and DG supply affects the electricity system, and could only be economically efficiently integrated if it provokes economically efficient, market-based responses by different stakeholders. The RESPOND project aims at identifying efficient market response options that actively contribute to an efficient integration of (intermittent) RES-E and DG in the European electricity system and it recommends policy and regulation framework improvements that effectively support these market response options. The RESPOND project puts emphasis on the market side of the electricity system. Efficient response options that (may) arise from the market form the basis on which policy on RES-E and DG should be based. It specifically considers the interactions between different segments of the electricity system: generation, demand, trade, and the networks. The electricity system is a «complex network» in which the constituent segments dynamically interact with each other.